package com.qq4j.openapi.utils;import java.util.Collection;/** * @author Hover Ruan */public class StringUtils {	public static boolean isBlank(String value) {		return !isNotBlank(value);	}	public static boolean isNotBlank(String value) {		return value != null && value.trim().length() > 0;	}	public static String join(Collection<String> strings, String sep) {		StringBuilder buf = new StringBuilder();		for (String str : strings) {			buf.append(sep).append(str);		}		return buf.substring(sep.length());	}}